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Alzheimer�s disease is a progressive, degenerative disease that attacks the brain and results in impaired memory, cognitive ability and behavior. Alzheimer�s is the most common form of dementia which is a medical condition that affects the brain. Over 4 million people have Alzheimer�s disease type dementia. Although Alzheimer�s disease can occur in persons in their 40s and 50s, most of those diagnosed with Alzheimer�s disease are 65 or older.